| BELLA VISTA CITY WATER SYSTEM | 20,045 | 1,564 | Detected |
| DOUGLAS CITY OF | 16,656 | 929 | Detected |
| US ARMY FORT HUACHUCA | 15,603 | 972 | Detected |
| PUEBLO DEL SOL WATER COMPANY | 12,804 | 2,721 | Clean |
| ARIZONA WATER CO - SIERRA VISTA | 9,175 | 85 | Detected |
| ARIZONA WATER CO - BISBEE | 8,707 | 32 | Detected |
| BENSON, CITY OF WATER SYSTEM | 5,355 | 253 | Detected |
| CITY OF WILLCOX | 3,236 | 220 | Detected |
| BISBEE DOUGLAS INTL AIRPORT | 2,600 | 172 | — |
| ADOT SAN SIMON REST AREA | 2,500 | 62 | — |
| BELLA VISTA WATER SOUTH | 2,178 | 425 | — |
| EAST SLOPE WATER COMPANY | 1,980 | 255 | — |
| TOWN OF HUACHUCA CITY | 1,750 | 220 | — |
| SOUTHLAND UTILITIES - GOLDEN ACRES | 1,614 | 211 | — |
| SOUTHERN SUNRISE WC COCHISE HORSESHOE | 1,588 | 272 | — |
| TOMBSTONE CITY OF | 1,545 | 744 | — |
| MESCAL LAKES WATER SYSTEM | 1,390 | 160 | — |
| CLEAR SPRINGS UTILITY MAIN | 1,385 | 57 | — |
| ST DAVID DWID | 1,255 | 79 | — |
| COCHISE COUNTY COMMUNITY COLLEGE DISTRIC | 1,120 | 200 | — |
| POMERENE DWID | 1,030 | 337 | — |
| ADOT TEXAS CANYON REST AREA | 1,006 | 36 | — |
| WHETSTONE DWID | 940 | 105 | — |
| ELFRIDA WID | 800 | 298 | — |
| APPLE ANNIES ORCHARD | 675 | 46 | — |
| NACO WATER CO MAIN | 658 | 106 | — |
| EAST SLOPE WATER - WEST | 655 | 198 | — |
| SOUTHERN SUNRISE WC MIRACLE VALLEY | 620 | 217 | — |
| NORTHERN SUNRISE WC CORONADO | 553 | 160 | — |
| BOWIE WID | 489 | 133 | — |
| ASPB KARTCHNER CAVERNS | 483 | 139 | — |
| DOUGLAS BORDER PATROL STATION | 450 | 143 | — |
| CORONADO ELEMENTARY | 446 | 99 | — |
| PALOMINAS ELEMENTARY | 421 | 60 | — |
| CS WINCHESTER WATER COMPANY | 402 | 128 | — |
| CS HOLIDAY WATER COMPANY | 395 | 99 | — |
| SIERRA VISTA MH VILLAGE | 328 | 118 | — |
| NORTHERN SUNRISE WC MUSTANG CRYSTAL | 315 | 467 | — |
| SAN SIMON DWID | 312 | 745 | — |
| FIESTA CANNING CO INC | 300 | 129 | — |
| DRAGOON WATER COMPANY | 283 | 374 | — |
| VALLEY VIEW ELEMENTARY | 231 | 95 | — |
| MOUNTAIN VIEW RV PARK | 200 | 27 | — |
| FORT BOWIE NATIONAL HISTORIC SITE | 200 | 29 | — |
| CHIRICAHUA NATL MONUMENT BONITA CG | 200 | 29 | — |
| WILLOW LAKES PROPERTY OWNERS ASSOC | 190 | 261 | — |
| WHETSTONE RANCH WATER SYSTEM | 183 | 24 | — |
| ADOT SAN SIMON PORT OF ENTRY | 175 | 49 | — |
| WESTERN REFINING SPEEDWAY 2962 | 162 | 10 | — |
| MONTE VISTA WATER COMPANY | 150 | 353 | — |